Figure 3.

(a) Multilayer variant of a fixed-volume droplet generator in which the bypass channel is connected to the main channel through a shallow slit. (b) Map of the flow rates of the continuous and dispersed phase showing the deviation of the measured length of the droplets from the reference length $⟨L⟩=9w$. (c) Time-series of the relative drop size and corresponding histogram for a fixed-volume droplet generator (blue dots) and a classic T-junction (red dots). The conditions are indicated by the circle in (b). The average droplet length in the fixed-volume droplet generator and classic T-junction were $⟨L⟩=8.2w$ and $⟨L⟩=3.6w$ respectively. (d) Same as in (c) with conditions indicated by the square in (b). The average length is $⟨L⟩=10.9w$ for both cases. Geometries: fixed-volume droplet generator ($w,w_t,w_b,h,h_{\text{slit}}$) = (400, 100, 600, 200,100) μm, classic T-junction (w, h) = (400, 200) μm.